Lots of registers shifting...
...to make audio synth-y goodness!
Tymkrs Analog Shift Kit: This is pretty neat, it is a PIC which acts like a DAC and as a shift register. It allows you to convert a 7-bit digital value into an analog value between 0 to 3.3V, and allows the serial data to pass through (if desired) to another module. (https://www.tindie.com/products/tymkrs/tymkrs-analog-shift-kit/)
Video: https://www.youtube.com/watch?v=2F9Y_RywjzI
Tymkrs AND8 Module: This is a module with 8 AND gates where one side of each gate is controlled by the output of a 74hc595 shift register and the other side of each gate is controlled by the input of 8 signals of your choice. (https://www.tindie.com/products/tymkrs/tymkrs-and8-module/)
Video: https://www.youtube.com/watch?v=kuG__jFfwHQ
Tymkrs MixMe 8: This module is a passive summing mixer for super cheap! It takes 8 signals in and gives you one signal out. We've used it with audio for great success! (https://www.tindie.com/products/tymkrs/tymkrs-mixme8-module/)
Video: https://www.youtube.com/watch?v=kuG__jFfwHQ
@atdiy/@tymkrs